/Engine/Source/Developer/AssetTools/Public/IAssetTools.h
Validate the destinations for advanced copy once the map has been flattened
bool ValidateFlattenedAdvancedCopyDestinations ( const [TMap](API\Runtime\Core\Containers\TMap)< [FString](API\Runtime\Core\Containers\FString), [FString](API\Runtime\Core\Containers\FString) > & FlattenedPackagesAndDestinations ) const